How to strip all non alphanumeric characters from a string in c++?

Question

I am writing a piece of software, and It require me to handle data I get from a webpage with libcurl. When I get the data, for some reason it has extra line breaks in it. I

Answer 1

Previous uses of std::isalnum won't compile with std::ptr_fun without passing the unary argument is requires, hence this solution with a lambda function should encapsulate the correct answer:

s.erase(std::remove_if(s.begin(), s.end(), 
[]( auto const& c ) -> bool { return !std::isalnum(c); } ), s.end());